v4.19.13 snapshot.
diff --git a/include/linux/errno.h b/include/linux/errno.h
new file mode 100644
index 0000000..3cba627
--- /dev/null
+++ b/include/linux/errno.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_ERRNO_H
+#define _LINUX_ERRNO_H
+
+#include <uapi/linux/errno.h>
+
+
+/*
+ * These should never be seen by user programs. To return one of ERESTART*
+ * codes, signal_pending() MUST be set. Note that ptrace can observe these
+ * at syscall exit tracing, but they will never be left for the debugged user
+ * process to see.
+ */
+#define ERESTARTSYS 512
+#define ERESTARTNOINTR 513
+#define ERESTARTNOHAND 514 /* restart if no handler.. */
+#define ENOIOCTLCMD 515 /* No ioctl command */
+#define ERESTART_RESTARTBLOCK 516 /* restart by calling sys_restart_syscall */
+#define EPROBE_DEFER 517 /* Driver requests probe retry */
+#define EOPENSTALE 518 /* open found a stale dentry */
+
+/* Defined for the NFSv3 protocol */
+#define EBADHANDLE 521 /* Illegal NFS file handle */
+#define ENOTSYNC 522 /* Update synchronization mismatch */
+#define EBADCOOKIE 523 /* Cookie is stale */
+#define ENOTSUPP 524 /* Operation is not supported */
+#define ETOOSMALL 525 /* Buffer or request is too small */
+#define ESERVERFAULT 526 /* An untranslatable error occurred */
+#define EBADTYPE 527 /* Type not supported by server */
+#define EJUKEBOX 528 /* Request initiated, but will not complete before timeout */
+#define EIOCBQUEUED 529 /* iocb queued, will get completion event */
+#define ERECALLCONFLICT 530 /* conflict with recalled state */
+
+#endif